Initial data and ideas for new 3 week version of single photon studies.

====== Part I ======

===== Setup =====

{{ :phylabs:lab_courses:phys-211-wiki-home:single-photon-interference-spring:down_conversion_setup.png?direct&400 |}}

Radius of curvature of guide = 84cm.

APD PULSES : Positive polarity, 4.3V, 16.5ns FWHM.

TAC set to 0.05μs range.

LASER Current = 70.7mA
LASER Temp = 10.31°C
===== Alignment and detection =====

===== Down Conversion Studies =====

Study of the DC dependence on pump beam polarization.



^ Angle  ^ Coincidences  ^ Green APD  ^ Blue APD  ^
| 0      | 136           | 8178       | 8000      |
| 10     | 1031          | 28736      | 16666     |
| 20     | 2686          | 66757      | 34285     |
| 30     | 3987          | 95635      | 46844     |
| 40     | 4472          | 106916     | 53472     |
| 45     | 4202          | 102661     | 52802     |
| 50     | 3903          | 93144      | 48764     |
| 60     | 2539          | 62332      | 33887     |
| 70     | 1055          | 29170      | 17967     |
| 80     | 94            | 7157       | 7185      |
| 90     | 136           | 8403       | 7653      |

{{ :phylabs:lab_courses:phys-211-wiki-home:single-photon-interference-spring:pump_pol.png?direct&400 |}}